Photoluminescence Characteristics of Sr₂SiO₄:Pb²⁺ Nano Phosphor by a Combustion Method

Abstract

In this study, lead doped strontium silicate (Sr₂SiO₄:Pb²⁺) phosphor was synthesized by a combustion method and the luminescent characteristics were investigated. This was done using X-ray diffraction (XRD), a Scanning Electron Microscope (SEM), and by measuring the photoluminescence (PL). At different temperatures, the XRD patterns showed the pure Sr₂SiO₄ phase. The intensity of the XRD peak showed its highest value at 1000°C. The PL intensity was observed to improve with an increasing sintering temperature (up to 1000°C), but a quenching effect appeared at 1200°C. The emission spectrum for a 291 nm excitation showed a single band, which peaked at 425 nm. The SEM images showed that with an increased sintering temperature the phosphor particles became spherical.

Keywords:

• Combustion method
• light-emitting diode
• phosphor
• Sr₂SiO₄

Acknowledgments

This work was supported by Energy Resource R&D program (20094010100060) under the Ministry of Knowledge Economy, Republic of Korea.

This research was supported by the Kyungwon University Research Fund in 2009.